Pump for corrosive liquids



Jan. 8, 1929.

s. P. FULLER PUIIP FOR CORROSIVE LIQUIDS Original Filed Oct. 1926 2 Sheets-Sheet Inventor, Q George PrescottFullen' Z. z BY fttorney.

. a. 1926 2 Shgts-Sheet 2 G. P PFU ER. PUMP F03 cofiRosIvE LIQUIDS Original Filed Oct Jan. 8, 1929.

George 'P'resottFuller: Q6 v Attorney 5 Patented Jan. 8, 1929.

i can s r GEORGE rnnsoor'r FULLER, or LA SALLE, NEW YORK, AssIenoR, BY, MESNE ASSIGN- MEN'IS, TO EDWARD MICHAEL, FRANK n. COLLINS, AND FRANK J. Tenn, CONSTI- TUTIN'G BONDHOLDERS COMPANY, Inc.

PROTECTIVE COMMITTEE onnLncrno Y'rro HOLDING PUMP non CORROSIVE LIQUIDS.

Applicationrfiled. October 8, 1926, Serial No. 149,274. Renewed November 3, 1928.

In the electrolytic production of iron it becomes necessary to circulate considerable quantities of ferrous chloride solution-, with which there may also be admixed ferrous chloride and free acids, at a temperature of around 80 degrees centlgrade. Such a solution at this temperature is highly corrosive and erosive of all materlals from which it has ments of such service, that is, effectively resists the corrosive or erosive action of such a solution at the temperatures encountered in service, is cementitious material such as cement or concrete which after the forming or molding thereof and thorough setting and drying has been impregnated with suitable material such sulphur to close the pores and keep the liquid from reaching embedded reinforcing material. An important object of the invention is to provide a pump which will meet the required conditions. Other objects of this invention are to provide a pump design which will permit of the use of the ma.- terial specified above in lieu of the materials which are ordinarily used in such mechanical structures, and a structure which will not require bearing surfaces of such material where there is any considerable pressure between the same and will also admit the use of reinforcing materials which have the requisite stiffness and tensile strength for the transmission ofpower for the operation of the pump.

. Other objects and advantages will hereinafter appear.

In the accompanying two sheets of drawings which form a part of this description,

Figure 1 is a vertical section through a centrifugal pump which embodies this invention on the line 11 of Fig. 2.

Figure 2 is an elevation of the pump with the cover to the casing removed and the impeller partly broken away.

Figure 3 is a front view of the split gland for the stuffing box.

Figure 4 is a side view of the same.

Figure 5 is a vertical section through the reinforcement for the impeller on the line VV of Fig. 6, the concrete formed around the reinforcement being shown in dotted outline, and

' cover plate 12. Sheets of expanded metal13,

13 are embedded in the walls ofthe casing,

nuts and bolts 14, 14 are embedded for attaching thereto an inlet pipe 15, and an outlet pipe .16, for bolting to the foundation, and for drawing upthe split gland 17 for the stufing box. Holes are left for through bolts 18, 18 by which the parts of the casing are held together, with a rubber gasket between. Plates 19, 19 of suitable material, suchas steel, are placed on the sides of the casing for: engagement by the nuts of the through boltsto distribute the strain.

Revolublymounted within the casing is an impeller of reinforced concrete which comprises two parallel shrouds 20, 20 with blades 21, 21 cast between the.shr0uds,and a portion or sleeve 22 which enters the stufiing box in the casing. Annular sheets 23, 23 of expanded metal reinforce the shrouds. the sleeve, which provides a protecting layer of concrete for the portion of the shaft which enters the stutfingbox from within the casing. A steel plate spider 25 is shrunk or otherwise secured on the end of the shaft and the spideris preferably extended to with- I in an inch of the periphery by the corresponding annular sheet 28 of expanded metal which is welded to the spider and is embedded in the corresponding shroud. Steel rods 26, 26 connect thelsheets of expanded metal in the two shrouds, .the ends of the rods being welded to the expanded metal. Steel pins 27, 27 set in the shaft serve .tosupport an expanded metal cylinder 28 which serves as .a reinforcement for the sleeve.

In making the impeller, the shaft and the reinforcing parts are assembled and connected to one another, as by welding, and concrete is then formed around them as by casting or molding, to produce the shrouds, blades and sleeve. Holes 29, 29 are cored through'the shrouds and blades to even up the pressure on the two sides of the impeller and give it hydraulic balance and also to lightenits weight. The, disks of expanded metal are A steel shaft 24. passesthrough" i also a thrust bearing.

provided before assembling with any openings or holes which may be'required. At the back of the impeller, there are provided four ribs 80, 30 to increase the centrifugal action on the liquid in the pump at the inner end of the stuffin'g' box and thus maintain the pressure at this point slightly below the exterior pressure, thereby preventing leakage of the solution at this point. The concrete is of selected materials, carefully mixed and Well tamped or compacted to insure uniformity and strength.

'After the concrete has thoroughly set and dried the sleeve is ground to a true cylinder with a perfectly smooth surface. The exposed portions of l the impeller are then smoothed offand it is carefully balanced by grinding and chipping the concretefrorn the sides of the shrouds." The balanced impeller and also the casing after thoroughly setting and drying are impregnated with molten sulphur-which fills the pores, increases the tensile strength, protects the reinforcing elements from chemical attack and imparts a smooth surfaeeso' that the liquidwill "pass through the pump more freely. Such an impeller, it has'bee'n found-may be safely driven at: a peripheral speed of 60 feetper second. The stuffing box is'packed with any suitable material such as ordinary ring packing. A stream of water from a pipe31 is-directed-into thestuiiing box from the outside and serves as a lubricant and also to'seal the opening, thereby preventing the sucking" of air into the pump" because of the difference between the exterior and the interior pressures.

The shaft is supported exterior to thepum casing by two bearings-32,32, one of which is The one which ad joins the pump may be close thereto but leaving sufficient room to "withdraw the gland,

' which is split, free from the smiling box to give access to the packing. These bea rirrgs support the shaft so that the stuffing box is not required to serve asa' bearing. As it may be inconvenient toform the impeller on a shaft which is long enough to reach from the impeller through both bearings, use may be made of a short length of shafting with its end cast in the'impeller and of anextension length of shafting 33 to run in the further bearing and attached to the short length of shafting by a coupling 34. The outer end of thisextension shafting is connected through a flanged coupling 85. to an electric motor or other driving mechanism.

It should be understood that the reinforcement of the concrete consist of any suitable materiahsuch as expanded or perforated box from within the casing.

2. In a centr'ifugal pump, an impeller comprising a metal spider, metallic reinforeing material including sheet inaterialsecui'ed crete on the portion which e'nters thestufiing to said spider andcementitiousmaterialeovering said spider and metallic reinforcing material to protect the same from l quid passing through the punip.-' l

o. In a centrifuga pump, a casing, a rev oluble member comprising a shaft and an impeller COHIPTlSlIIg' a spider on the end of said shaft, reinforcing material arranged around said shaft adjacent thespider, reinforcing means attached to. said spider to determine the generaloutline of said impeller,

and resistant celnentitious material applied about said shaft, spider and reinforei-ngnnaterial to form theeX-posed part of the impel ler and a cylindrical member surrounding the shaft and adapted to fit an opening in the casing;

4t. In a centrifugal pump, an impeller comprising a metal spider,- metal reinforcing ma terial, corrosive-resistant material surround ing said spider and forming a part-adapted to be journaled in an opening in the pump casing,- and adriv-ing' shaft extending into said part and fixed to the'spider.

In witness whereof, I 'afliX my signature.

GEORGE PRESCOTT FULLER. 

